646851282 has 64 divisors (see below), whose sum is σ = 1615832064. Its totient is φ = 167711040.

The previous prime is 646851277. The next prime is 646851307. The reversal of 646851282 is 282158646.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 381228 + ... + 382920.

It is an arithmetic number, because the mean of its divisors is an integer number (25247376).

Almost surely, 2^646851282 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646851282, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (807916032).

646851282 is an abundant number, since it is smaller than the sum of its proper divisors (968980782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646851282 is a wasteful number, since it uses less digits than its factorization.

646851282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543.

The product of its digits is 184320, while the sum is 42.

The square root of 646851282 is about 25433.2711620035. The cubic root of 646851282 is about 864.8381008323.

The spelling of 646851282 in words is "six hundred forty-six million, eight hundred fifty-one thousand, two hundred eighty-two".